You can ignore exit pupil size. It means nothing when determining the width of the FOV from specs.
There two kinds of FOV specs - real and apparent. Meters at 1000m is an old convention in binocular specs for expressing the real field. It tells you how wide a swath of real estate is contained in the binocular FOV at 1000 meters (or it may be expressed in feet at 1000 yards to add to the confusion). The real field may also be expressed in degrees formed by the pie slice of real area contained in the FOV.
I expect that what you want to know is the apparent or subjective field. That's the angle of the pie slice formed inside your eyeball when the binocular FOV is projected onto your retina. It determines how "claustrophobic" the view appears to be. It's advantage as a spec is that it is independent of magnification. A 60º apparent field always fills the same area of of the retina whether the binocular is 6x or 10x, so one number is all you need to know to predict whether a binocular should be considered a wide or a narrow field instrument. FOV expressed in real field requires adjusting for each magnification. For instance, your example of 143M @ 1000M would be an extremely wide angle binocular at 10x with an apparent FOV of about 82º, but it would be a somewhat claustrophobic 49º at 6x.
Unfortunately, apparent field is not always consistent in specs. It is often approximated using two different methods that give different results and occasionally actually measured. As always it's best to try for yourself, but as a general rule of thumb AFOV below about 55-57º may appear claustrophobic while AFOV above 60º probably won't.